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4 years ago

11

Write two expressions that are equivalent to 2(x+4)

2 answers:

SIZIF [17.4K]4 years ago

6 0

Answer: 2x+8, 8+x

Step-by-step explanation:

You had 2(x+4), so, 2*x=2x+2*4=8 so, 2x+8

For the second one just multiply 2 and 4= 8+x all by itself =8+x

Gemiola [76]4 years ago

3 0

2(x+4) =

2x + 8
2x + 4(2)

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The average of 8 scores is Q. If the average of 3 of the scores is Z, what is the average of the other 5 scores?

OLga [1]

$\dfrac{s_1+\cdots+s_8}{8}=Q\implies s_1+\cdots+s_8=8Q$
$\dfrac{s_1+s_2+s_3}{3}=Z\implies s_1+s_2+s_3=3Z$

Substituting into the first equation, this means

$s_4+\cdots+s_8=8Q-3Z$

Divide by 5 to get the average:

$\dfrac{s_4+\cdots+s_8}{5}=\dfrac{8Q-3Z}5$

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3 years ago

The height of a flare fired from the deck of a ship in distress can be modeled by h=-16t^2+104t+56, where h is the height of the

grin007 [14]

Answer:

7 seconds.

Step-by-step explanation:

We have been given that the height of a flare fired from the deck of a ship in distress can be modeled by $h=-16t^2+104t+56$ , where h is the height of the flare above water and t is the time in seconds.

The ball will hit the ground, when height will be 0 meters, so we will equate $h=0$ to find the time when ball will hit the ground as:

$-16t^2+104t+56=0$

Using quadratic formula, we will get:

$t=\frac{-104\pm\sqrt{104^2-4(-16)(56)}}{2(-16)}$

$t=\frac{-104\pm\sqrt{10816+3584}}{-32}$

$t=\frac{-104\pm\sqrt{14400}}{-32}$

$t=\frac{-104\pm120}{-32}$

$t=\frac{-104+120}{-32}\text{ or }t=\frac{-104-120}{-32}$

$t=\frac{16}{-32}\text{ or }t=\frac{-224}{-32}$

$t=-\frac{1}{2}\text{ or }t=7$

Since time cannot be negative, therefore, it will take 7 seconds for the flare to hit the ground.

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3 years ago

What is the only real number which, when divided by itself, is 2020<br> times itself?

malfutka [58]

Answer:

20

Step-by-step explanation:

I'm not sure at all I'm sorry

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3 years ago

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Dalia owns a gravel pit. She took a random sample of rocks and counted 585858 sedimentary rocks, 213213213 metamorphic rocks, an

goblinko [34]

step One

Find the total number of rocks in the gravel pit

<em>58 + 213 + 522 = 793</em>

Step Two

<em>Set up the probabilities.</em>

<em>P(Sedimentary) = 58 / 793 = 0.0731</em>

<em>P(metamorphic) = 213/ 793 =0.2686</em>

<em>P(igneous) = 522 / 793 = 0.6583</em>

Check

<em>When these are added together the answer should be one.</em>

<em>0.0731 + 0.2686 + 0.6583 = 1 just as it should.</em>

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